IDEC High Performance Series - Manual (Page 593)

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5 Data Memory (DM) Allocation
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External Device Setup Manual
5 Data Memory (DM) Allocation
With the DM Link communication, DM0 to DM13 and DM16 to DM8191 are the user area that you can freely use. DM14 and DM15
are allocated as the event data transmission control area.
5.1 System Area
If you allocate DM for use as the system area, make the start address for the system area DM0 or after DM16 to avoid the overlapping
DM14 and DM15. For further details regarding the system area, refer to theWindO/I-NV2 User’s Manual or SmartAXIS Touch
User's Manual.
5.2 D0 to D11 Event Transmission (DM14)
You can set whether or not DM0 to DM11 are to perform event transmission. When the value in DM14 is 1, system area event trans-
mission is performed, and when it is 0, it is not performed. After power up the value in DM14 is set to 0. Use this in the case that
DM0 to DM11 is specified as the system area.
5.3 Event Area Setting (DM15)
Specify the start address for the event area in DM15. The area after the specified address is then allowed to be used for event data
transmission. For example, if the value 256 is written to DM15, the area from DM256 to DM8191 becomes the event area, and if the
data in this area changes an event data transmission is performed. After power up, the value in DM15 is 512.
Event data transmission is not performed in the following cases:
5.4 User Area (DM16 to DM8191)
You can freely make use of the area from DM16 to DM8191. Use this area to exchange data with the external device.
Data Memory Description
DM0 to 11 User Area (Event Transmission can be available)
DM12, 13 User Area (Event Transmission is not available)
DM14 D0 to D11 event output enable/disable setting
DM15 Event area start address setting
DM16 to 8191 User Area
(1) When a value equal to or larger than 8192 is written to DM15.
(2) When DM Link 1:N communication is selected.
(3) When the serial interface is RS422/485 2-wire.
(4) When data in the event area is modified by a write command from the external device.